Definition of ethinyl estradiol
: a very potent synthetic estrogen C20H24O2 used especially as an oral contraceptive
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Recent Examples of ethinyl estradiol from the Web
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Tyler’s experiments looked at one type of synthetic estrogen: ethinyl estradiol, or EE2, which is found in oral contraceptives like TriNessa and Seasonique.
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One environmental estrogen is ethinyl estradiol—a chemical found in birth control pills.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ethinyl estradiol.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of ethinyl estradiol
1938
Medical Dictionary
ethinyl estradiol
medical Definition of ethinyl estradiol
: a white crystalline very potent synthetic estrogen C20H24O2 prepared from estrone and used in combination (as with norgestrel or norethindrone) as a birth control pill or alone in the treatment of menopausal symptoms or female hypogonadism or in the palliative treatment of prostate or breast cancer — see loestrin, minastrin, nuvaring, ortho evra, ortho-novum, ortho tri-cyclen, seasonale, seasonique, yasmin, yaz
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